Method and material for repairing shoes



11% Drawing.

in fi shoes. q

at hand in the ordinary home:

NATIQ onto; essieuons ro TH elm-mQ 119 efsqaa eenovo pma p mn'rnonaun'i amnmnn non. "nnrkruius snons J I This ,inveht i pairing i worn shoes janldj similar, rticles. The vent n w ire aese rf as ee e s seda e spa ng sw r edbi tfftl h e t r bvid a Pro essed produc s inch t i dt nary individual mayrepair his. or her [worn shoes without I the pioymene ;of special m technical skill anti withoutthe use of;appa- ,ratus or equ pment or ;facilitiesnotireadily The, invention compr ses three i l the first ofwhich isfito @ugheagthe sole of the 11 shoe somewhat, the second of which isto apply an adhesive liquid coating to therough ened sole, and the third of which is to apply a plastic, moldable, workable material to the adhesive liquid coating to build-or recon- 20 stitute the soleto the "desired thickness and proportions. The heel of the shoe may, of course, be similarly repaired.

From the point of VlGW Of marketing the process and products to the public, it is neces 25 sary to provide liquid coating compositions and plastic materials which do not harden in the containers in which they are marketed. Forthe purpose of providing a strong, new shoe sole it is requisite that the plastic ma i-P terial harden Very materially when applied to the shoe. The invention may therefore be said to reside in the discovery and determination that a liquid coating composition com prlsing rubber cement and an accelerator of 1 vulcanization, but no sulfur, and a plastic material comprisingrubber and sulfur, but no accelerator of vulcanization, constitutes a combination possessed of the necessary properties specified above.

The rubber cement container because nosulfur is present.

t s t 3a mes the mama; age.mama 29, 1931. Serial No. 565,922.!

rnernocry MANUFACTURING company, or omby the plastic material at ordi- M narywroom temperature without the of molds-for heat.

p In practice shoefsole isroughenedi two coatings of theliquidrubber cement appliedk When the second coating becomes ltacky, .the; plastic material containing the .rnbber i is molded over: the; rubber cement either'with a knife or with the fingers. After :Sbfllldlllg overnight, thenew sole issuflicient- .ly Lhardened 1 to permit; Zthe wearing of the shoes 1 Further hardeningdtakes place over a period.ofseveraldays. E

' i -In the plastic materialit isusually able to incorporate fibers, fillers, rubber .used in: the compounding of: rubber products.

rubber cement maybe tetra-inethyl-thiura ndisulfide i also tetra-methyl-thiurain-monosulfide, i di-thio-vcarbonates, such as zinc-diinethyl ditine-carbonate, lead-,di methyl-di- -.thio carbonate, or diqihenyl guanidine. The =selectioni otthe particular accelerator in; regard to. .the selectionflof the ingredients for i the plastic iswithinithe skill of the art.

. One example responsiveito this invention is i ,asfollowsm does not harden in the The plastic material does not harden or vulcanize in the container due "to the absence of an acceleratorof vulcanization. When, however, the rubber cement with the accelerator in it is applied to theshoe, and the plastic material containing rubber and sulfur placed L .55 wtouglieners, and other ingredients frequently F o'rmula for cement Rubber 6 pounds Rosin 2.5 pounds Benzol 15 gallons Zinc di-methyl-di -thio-carbonate (or other ultra-accelerators) 1.5 pounds These ingredients are added to the benzol and stirred until the rubber is dissolved. Two coats of this cement are applied to the roughened shoe sole and allowed to dry. The plastic is then applied about one-fourth inch thick and allowed to dry overnight. The shoes may then be worn, but may not reach their final and complete cure for two more days.

The plastic or workable qualities of the stantially the shape adapted 'to constitute the desired repair, securing said plastic material to the shoe bymeans of a rubber cement containing a room temperature accelerator of vulcanization and drying, hardening and curing said plastic material at substantially room temperature on said shoe by reason of the simultaneous evaporation of the rubber solvent and the migration of said accelerator into the plastic composition.

3. A method of repairing articles made of rubber, leather, and the like, said method, comprising, molding a plastic rubber composition comprising rubber, a volatile solvent therefor, and sulfur, substantially into the shape to constitute the desired repair, securing said molded plastic material to the article being repaired by means of a rubber cement containing a room temperature accelerator of vulcanization, and hardening and curing said plastic material at substantially room temperature by reason of the simultaneous evaporation of the rubber solvent and the migration of said accelerator into the position.

In witness whereof, we hereunto subscribe our names.

ROLAND R. BOLLMAN. CONRAD L. ORNES.

plastic material above described, or other plastic materials responsive to this invention, may be further increased by the addition to the admixture of materials such as ethyl or methyl alcohol, isopropyl alcohol acetones or other ketones or alcohols comprising as a class materials which are not solvents for rubber but which are admixable with benzol or the rubber solvent selected for practicing the invention. As an example, 25 pounds of ethyl alcohol of about 9095% strength may be added to the above specified admixture and the plastic or workable qualities of I the material are thereby improved.

'Having described our invention, we desire to be limited only by the ensuing claims 1. A method of repairing worn shoe soles, said method comprising, molding'a plastic rubber composition comprising rubber, a volatile solvent therefor, alcohol and sulfur into substantially the'shape adapted to constitute the desired repair, securing said plas tic material to the shoe by means of a rubber cement containing a room temperature accelerator of vulcanization and drying, hardening-and curing said plastic material at substantially room temperature on said shoe by reason of the simultaneous evaporation of the rubber solvent and the migration of said accelerator into the plastic composition.

2. A method of repairing worn shoe soles, said method comprising, molding a plastic rubber composition comprising rubber, a volatile solvent therefor, and sulfur, into subplastic com- 

